Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8c99b39cd77df4a57b7b056d562ad1c1adb1890e9a3b1999c6765f9233bdad3' 
  AND token = 'agh9qtClwEwX+CK5RwyPqkfqgd7a0fkVfejy0tBHBVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}